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    SubjectRe: Can context switches be faster?
    On Fri, 13 Oct 2006, James Courtier-Dutton wrote:

    > Arjan van de Ven wrote:
    >> On Thu, 2006-10-12 at 14:25 -0400, John Richard Moser wrote:
    >>
    >>
    >>> - Does the current code act on these behaviors, or just flush all
    >>> cache regardless?
    >>
    >> the cache flushing is a per architecture property. On x86, the cache
    >> flushing isn't needed; but a TLB flush is. Depending on your hardware
    >> that can be expensive as well.
    >>
    >
    > So, that is needed for a full process context switch to another process.
    > Is the context switch between threads quicker as it should not need to
    > flush the TLB?

    Indeed. This is also true for switching from a process to a kernel thread
    and back, because kernel threads don't have their own user-space virtual
    memory; they just live inside the kernel virtual memory mapped into every
    process.

    > James
    >

    Thanks,
    Chase
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